I'm in Phoenix as well. As you know, once it warms up here, the hottest part of the day is typically when you are dropping the package off. Once it warms up everywhere else it's pretty hot here. You can always consider a mostly defrosted cold pack. This way it will slightly cool the package for a couple hours while it's still here in Phoenix. It will then be defrosted when the package leaves and is in the air.
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